It started off as just a small thought, at least you think it did. A small interest. From the first moment you met Katsuki you took a liking to him. Even with his temper and his ego that strayed so many people away, you were intrigued. It was just something about him. Katsuki grew used to having you around. But it started feeling strange to him when you began dating. Things you did that just left him with a weird feeling in his stomach.